2787139 has 4 divisors (see below), whose sum is σ = 2855160. Its totient is φ = 2719120.

The previous prime is 2787121. The next prime is 2787143. The reversal of 2787139 is 9317872.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2787139 - 2⁵ = 2787107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2787098 and 2787107.

It is not an unprimeable number, because it can be changed into a prime (2787119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33949 + ... + 34030.

It is an arithmetic number, because the mean of its divisors is an integer number (713790).

2^2787139 is an apocalyptic number.

2787139 is a deficient number, since it is larger than the sum of its proper divisors (68021).

2787139 is an equidigital number, since it uses as much as digits as its factorization.

2787139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68020.

The product of its digits is 21168, while the sum is 37.

The square root of 2787139 is about 1669.4726712348. The cubic root of 2787139 is about 140.7298450381.

It can be divided in two parts, 2787 and 139, that added together give a triangular number (2926 = T₇₆).

The spelling of 2787139 in words is "two million, seven hundred eighty-seven thousand, one hundred thirty-nine".